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Chapter 11 Interfaces

ZyWALL USG 50 User’s Guide

* - You cannot set up a PPP interface, virtual Ethernet interface or virtual VLAN interface if the underlying 

interface is a member of a bridge. You also cannot add an Ethernet interface or VLAN interface to a 
bridge if the member interface has a virtual interface or PPP interface on top of it.

• See 

 details on the differences between physical ports, 

interfaces, and zones in the ZyWALL.

• See 

 for related information about the Interface 

screens. 

• See 

 for background information on interfaces.

• See 

 for an example of configuring Ethernet interfaces, 

port  role, and zones.

• See 

 for an example of configuring a cellular (3G) 

interface.

• See 

 to configure load balancing using trunks.

To access this screen, click Configuration > Network > Interface > Port Role. 
Use the Port Role screen to set the ZyWALL’s flexible ports as part of the lan1, 
lan2 or dmz interfaces. This creates a hardware connection between the physical 
ports at the layer-2 (data link, MAC address) level. This provides wire-speed 
throughput but no security.

Note the following if you are configuring from a computer connected to a lan1, 
lan2 or dmz port and change the port's role:

PPP interface

WAN1, WAN2

virtual interface

(virtual Ethernet 
interface)

(virtual VLAN interface)

(virtual bridge 
interface)

Ethernet interface*

VLAN interface*

bridge interface

trunk

Ethernet interface

Cellular interface

VLAN interface

bridge interface

PPP interface

Table 52   Relationships Between Different Types of Interfaces (continued)